|
| year | production | change |
| 1980 | 46 | NA |
| 1981 | 46 | 0.00 % |
| 1982 | 50 | 8.70 % |
| 1983 | 44 | -12.00 % |
| 1984 | 41 | -6.82 % |
| 1985 | 41 | 0.00 % |
| 1986 | 46 | 12.20 % |
| 1987 | 51 | 10.87 % |
| 1988 | 50 | -1.96 % |
| 1989 | 56 | 12.00 % |
| 1990 | 73 | 30.36 % |
| 1991 | 88.34 | 21.01 % |
| 1992 | 83.53 | -5.44 % |
| 1993 | 76.24 | -8.73 % |
| 1994 | 72.4 | -5.04 % |
| 1995 | 67.47 | -6.81 % |
| 1996 | 67.18 | -0.43 % |
| 1997 | 67.6 | 0.63 % |
| 1998 | 65.25 | -3.48 % |
| 1999 | 59 | -9.58 % |
| 2000 | 52.68 | -10.71 % |
| 2001 | 48 | -8.88 % |
| 2002 | 46.67 | -2.77 % |
| 2003 | 45.17 | -3.21 % |
| 2004 | 42.42 | -6.09 % |
| 2005 | 43.67 | 2.95 % |
| 2006 | 42.16 | -3.46 % |
Source: United States Energy Information Administration
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